CRREL_EM_drill_leaf_springs_and_hinged_friction_blades.png
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Summary
| Description |
English:
Anti-torque mechanisms on the 1960s CRREL EM drill, showing leaf springs and hinged friction blades
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| Date | |
| Source | Talalay, Pavel G.; Fan, Xiaopeng; Zheng, Zhichuan; Xue, Jun; Cao, Pinlu; Zhang, Nan; Wang, Rusheng; Yu, Dahui; Yu, Chengfeng; Zhang, Yunlong; Zhang, Qi; Su, Kai; Zhan, Dongdong; Zhan, Jiewei (2014). "Anti-torque systems of electromechanical cable-suspended drills and test results" (PDF). Annals of Glaciology. 55 (68): p. 208. |
| Author | Herb Ueda |
Licensing
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This work is in the
public domain
in the United States because it is a
work prepared by an officer or employee of the United States Government as part of that person’s official duties
under the terms of
Title 17, Chapter 1, Section 105
of the
US Code
.
Note
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United States Postal Service
since 1978
. (See §
313.6(C)(1)
of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see
The US Mint Terms of Use
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